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Agenda Meeting 26-05-2004 [message #96 is a reply to message #30] Tue, 25 May 2004 05:40 Go to previous messageGo to previous message
gaede
Messages: 232
Registered: January 2004
Location: DESY, Hamburg
Dear all,

as discussed in our last meeting I post the proposed agenda for tomorrows meeting in the forum. (We can probably simply edit this message to include the minutes after the meeting in order to restrict the number of postings to one per meeting).

Agenda Meeting 26-05-2004
-------------------------

1) Status f77, java, cpp

2) Reconstruction data model:

a) TJs comments on Tracks and LCRelations

b) user extensions (see message #94 in this forum)

c) extension to Track: getRadiusOfInnermostHit()

3) Transient LCCollections and multiple containment of one object
Discussing with users from DESY it turned out that they would need the possibility to create subcollections of existing collections, e.g. to analyze e+e->HH->l+l-,jets one would pass a list of all tracks except the two identified leptons to a jet algorithm. Copying the tracks is prohibitive in terms of memory and cpu, simply creating a collection with pointers to existing tracks will cause a segmentation violation (in C++,f77) when the event is deleted, as the assumption is made that every object is contained uniquely in one collection. One way around that is to keep an additional reference to every object in an event and delete objects to wrt. that list. Another way would be to tag the collection as 'transient' and then not delete 'objects' in transient collections. To my mind these are independent concepts and we should implement both: allow one object to be contained in more than one collection and allow for users to flag collections as transient, i.e. they are only used as input to some subsequent analysis/reconstruction module.

4) Other issues



Frank.
 
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